The U.S. Customs Service announced plans Friday to help speed Americans through the federal inspection process at four major airports when they return from abroad.

Passengers bringing back nothing that must be declared generally will be able to present their passport to an immigration inspector, claim their baggage and leave without a stop at Customs.Passengers with items to declare will make only a brief stop at a Customs or Agriculture station before being cleared, the agency said, adding that an improved computerized screening program will help pick out potential smugglers and terrorists.

It will begin this summer at Los Angeles, San Francisco and Chicago. It will start later this year at Miami, the agency said.